Styles make fights, I think Burns just really went for it and optimized himself for Zat. This will probably be a wild one off for Zat like Kelvin was to Izzy. Who else at WW has as good of a ground game as Burns and as much speed & power? Luque is close to it, but I think he'd get overwhelmed on the ground.
Colby has superior cardio, but he couldn't take Zat down and he doesn't have enough power to bother him on the feet. Usman has it all, but there's that time bomb of his mounting injuries.
I think Zat beats Izzy when he gets there. Especially at MW with more power and durability. As I feel it would be one big torrent of no ego bullshit take down spamming.
Ironically, I don't think Islam has had a Burns-level test yet. It's not his fault the opposition has been so easy or favorable, but I have no clue how he'd react vs adversity on every front - cardio, striking, power, grappling - which Khamzat would definitely offer him.
Anyway, I enjoyed this fight. Zat is a certified elite contender. Everyone's doubting his GOAT potential when all I really wanted was just quality fresh face at WW rankings.